The shoe example seems closer to a weaker version of this effect: https://www.illusionsindex.org/i/grey-strawberries https://www.illusionsindex.org/i/grey-straw

The shoe example seems closer to a weaker version of this effect: https://www.illusionsindex.org/i/grey-strawberries https://www.illusionsindex.org/i/grey-strawberries