Domenico Ghirlandaio, Sketch of the Colosseum. 1400s

I know this is not a painting, nor is this Ghirlandaio's most famous work, but it captures what type of artist he was and how he was not an impostor or fake.

It was said that Ghirlandaio was an expert at sketching without a ruler or compass. This is not typical of most painters or artists of this time. He was able to work with just his eyes and did not need to measure his subject. He sketched objects such as columns, birds, amphitheaters, and arches.  These were all studied and found to be perfect in proportion. Sometimes he would even sketch a little person next to his subject so the viewer can see that the proportions were perfectly even.

This sketch of the Colosseum is very impressive. Compared to a picture from now you can see no difference in the location of cracks, archways, and windows. It looks as if he used a ruler or a compass to get the measurements exact, but when you find out he did not, you cannot help yourself from being stunned and amazed.