Mich. Comp. Laws § 18.73

Sec. 3. The fund may derive income from: (a) Gifts, if the terms of the gift are consistent with the purposes of this act and other lawful requirements. (b) Transfers from appropriations for specific capital outlay projects, if the projects are estimated to cost at least $250,000.00 and are identified by the legislature to include art. Each transfer to the fund shall be specifically designated by the legislature, be made only at the time when project money is appropriated, and not exceed 1% of the total appropriation for a specific project. (c) Other appropriations made by the legislature.