diff --git a/Makefile b/Makefile
index 4d0dcb6..d2723ef 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ SOURCEFILES = cpp
 SRCDIR = src
 TMPDIR = build
 TARGET = gross
-FILES = main
+FILES = Chromosome main
 
 #SOURCES = $(patsubst %,$(SRCDIR)/%.cpp,$(FILES))
 OBJECTS = $(patsubst %,$(TMPDIR)/%.o,$(FILES))
diff --git a/src/Chromosome.cpp b/src/Chromosome.cpp
new file mode 100644
index 0000000..34d36a4
--- /dev/null
+++ b/src/Chromosome.cpp
@@ -0,0 +1,57 @@
+#include "Chromosome.hpp"
+
+
+
+/*
+class Chromosome : public sf::Drawable
+{
+public:
+	Chromosome();  // create empty chromosome
+	Chromosome(Chromosome& father, Chromosome& mother);  // cross over two chromosomes
+	
+	void mutate();  // randomly mutate chromosome's genes
+	
+	virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const;
+	
+private:
+	struct Gene
+	{
+		sf::Vector2f position;
+		float size;
+		sf::Color color;
+	};
+	
+	sf::CircleShape circle;  // drawing the chromosome, one draw call at a time
+	std::vector<Gene> genes;
+};
+*/
+
+Chromosome::Chromosome()
+{
+	// this->genes is already empty
+};
+
+Chromosome::Chromosome(Chromosome& father, Chromosome& mother) {
+	// randomly swap father and mother
+	if (/*TODO: random bool*/ false) {
+		Chromosome& tmp = father;
+		father = mother;
+		mother = tmp;
+	}
+	
+	// replace random segment of mother with random segment of father
+	
+	// TODO: in seperate function:
+	// finding random segment:
+	// randomly find starting position, then length
+	// find starting iterator, then end iterator
+	
+	// using function from above:
+	// find father segment: f_start, f_stop (iterators)
+	// find mother segment: m_start, m_stop (iterators)
+	
+	// RIGHT:
+	// append mother until m_start
+	// append father from f_start to f_end
+	// append mother from m_end
+}
diff --git a/src/Chromosome.hpp b/src/Chromosome.hpp
new file mode 100644
index 0000000..822ed9e
--- /dev/null
+++ b/src/Chromosome.hpp
@@ -0,0 +1,33 @@
+#pragma once
+
+#include <SFML/Graphics.hpp>
+
+
+
+class Chromosome : public sf::Drawable
+{
+public:
+	Chromosome();  // create empty chromosome
+	Chromosome(Chromosome& father, Chromosome& mother);  // cross over two chromosomes
+	
+	void mutate();  // randomly mutate chromosome's genes
+	
+	virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const;
+	
+private:
+	// TODO: random numbers
+	// pass as reference to Chromosome and Mutate?
+	// pass as reference on object creation?
+	
+	struct Gene
+	{
+		sf::Vector2f position;
+		float size;
+		sf::Color color;
+	};
+	
+	sf::CircleShape circle;  // drawing the chromosome, one draw call at a time
+	
+	size_t genesize = 0;
+	std::forward_list<Gene> genes;
+};
diff --git a/src/main.cpp b/src/main.cpp
index 6c07acd..845585e 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -45,6 +45,64 @@
  *  - invisible?
  */
 
+/*
+ * Project structure plan:
+ * - Chromosome
+ *  - static (class) size variables
+ *   - prevents situation where two differently-sized chromosomes mate
+ *  - can mate
+ *  - can mutate
+ *   - add circle
+ *   - remove circle
+ *   - change circle (stays at same layer)
+ *   - maybe change circle color, size, position separately, or all at once
+ *   - move circle (between layers)
+ *  - can be rendered to texture
+ * - Comparator (fitness tester) (maybe just function in Generations)
+ *  - can render progress/info to window (simple renderable)
+ *   - c.compare() sets variables in instance, draw directly after compare()-ing
+ *   - screen update logic in Generations
+ *  - initialized with size (or static size variables?)
+ *  - compares two textures
+ * - Generations
+ *  - keeps track of Chromosomes
+ *  - applies fitness function to Chromosomes
+ *  - applies selection to Chromosomes
+ *  - makes Chromosomes mate and mutate
+ *   - mutate only freshly mated chromosomes
+ *  - displays various states of genetic algorithm
+ * - Graph
+ *  - displays nice graph for use with Generations
+ * - Button?
+ */
+
+/*
+ * Generations states:
+ * - display generation stats (resting) (all other visual states optional)
+ * - run modes: step-by-step, visual, fast, off?
+ * - toggles for visibility of steps?
+ * - display evaluating fitness process
+ *  - step-through: both images, image diff, chromosome stats (fitness etc.), generation stats
+ *                  autorun mode
+ *  - fast: only generation stats, updated every half second or so
+ *  - off: nothing rendered at all
+ * - display selection process
+ *  - show all chromosomes, in tiny RenderTextures?
+ *  - show big version on hover-over, including original image?
+ *  - sort and move to respective position
+ *  - blend out deleted ones (set opacity to 0)
+ * - display mating process
+ *  - show parents
+ *  - show result
+ *  - show chromosomes? (string of circles maybe?)
+ *  - show parent fitness?
+ * 
+ * We've come full circle!
+ * 
+ * Further notes:
+ * - controls for stepping <-> runnning with delay
+ */
+
 int main() {
 	const float winW = 480;
 	const float winH = 480;